Lamp head



June 12, 1928. y 1,673,377

c. SKLAREK LAMP HEAD A nllllum mmy m @Q W MMM' Patented June 12, 1928.

UNITED STATES PATENT OFFICE.

CLIFIURD SILAREK, OF CHCAGO, 4ILlillltll, ASSIGR-TO INTERNATIONAL SPOT-LIGHT CORPORATION, 0F CHICAGO. ILLNOIS, A. CIOR1?1'.)lik'lllilil` FILLINQIS.

LAMP HEAD.

Application filed March 12, 1923.

This invention relates to improvements in lamp heads.

One object of the invention is to provide a lamp head particularlyadapted for use in connection with automobiles, wherein means isprovided for adjusting the lainp bulb with reference to the parabolicreflector, to obtain a true focus of the light rays.

Another and rnore specicoloject ol the invention is to provide a lamphead or the character indicated, wherein the parabolic reflector isprovided with a` sleeve, rigid therewith, slidably receiving thebulb-holding` socket ilor adjustment therein.

A further object of the invention is to provide a lamp head of thecl'iaracter indicated, with means for adjusting the hnlh l'iolding lampsocket with reference 'to the reflector, wherein the means formanipulating the adjusting ineens is located exteriorly of the head,where itv is readily accessible to the operator.

A still further object or' the invention is to provide a lamp head of'the character indicated. wherein all joints are effectively sealed toprevent moisture 'lrorn entering the head.

A specific object of the invention is to provide. in a lamp head havinga rellector.` nie-ans for supporting and guiding a lamp hulb withrespect to the reflector, in such a. manner that the adjustment orposition or' the lamp hull) cannot he injnriously allected as; a. resultof shrinkage of insulating inaterial.

Other objects' and advantagesoi the invention will more clearly appearfrom the description and claims hereinafter following.

ln the drawing, forming a part oi? this specification. Fig. 1 is a frontelevational view oi" a lamp head showing my improvements therewith. Fig.Q is a vertical, longitudinal, sectional view, taken substantially on aplane passing diametrically through the lamp head., certain parts beingshown in elevation. Fig. 3 is a detail sectional view, correspondingsubstantially to the line 3`3 ot' Fig. l; and Fig. f1 is an enlarged,detail, loi'igitndinal vertical sectional view of the lainp socket,sleeve' and adjacent parts shown. in Fig. 2.

In. said drawing, 1.0 indicates a generally howl-:shape sheet metalshell forming a serial No. 624,376.

housing for the parts of the lamp lhead'. The rear end of the shell 10isv provided with an integral, outwardly drawn, hollow protuherance 11,for a `purpose hereinafter `described. At the outer side, the shell 10is provided with anintegral, annular peripheral rini 12 as clearly shownin Figp. The riin 12 is in the forni of a flange of right angular crosssection comprising an annular flat portion 13 extending outwardly atright angles to the adjacent cylindrical end portion 14 ot' the shell10, and a rearwardly extending' cylindrical portion 15 spaced from thecylindrical portion 14 and parallel thereto.

Houscd within the shell 10 is a parabolic reflector v16 provided with acentral perforation 1T adapted to snugly receive the reduced end 18 ot'a cylindrical metal sleeve 19, the vouter edge of the sleeve beingswaged over the edge of the perforation to rigidly secure the sleeve tothe reflector. The outer edge oi" the reflector 16 is expanded toprovide an integral annular rim 9.0 and an annular shoulder 2l extendingat right angles to the rim.4 Inwardly of the shoulder, the adjacentportion of the reflector 16 is of an externqal diameter to snugly titwithin the outer cylindrical end portion 14 of theshell 10,r and holdthe reflector properly centered within the shell 10, with the shoulder21 thereotl inahntinent with the rirn 12 of the shell.

The lamp head is'- provided with the usual disc shaped lens 22, Whichisheldin position hy a flanged clamping ring E23 of U- shaped crosssection. The clanipingrring 23 is of split forni as clearly shown inFig. 1, and is provided withk perforated lugs 24 adjacent they split,adapted to receive a clamping holt 25 by which the ring is positivelyheld in closed position. To prevent moisture from entering the shell atthe joint between the saine and the lens 2Q, an annular gasket 26 isinterposed between the rim of the lens and the shoulder 21 of thereflector 16. As clearly shown in Fig. 3 the outer annular flange of theclamping ring 23 is adapted to over-lap the periphery ot'. the lens.While. the :inner flange thereof engages in back oi the portion 15 ofthe rim 13 of the shell, thus holding the lens, gasket and reflectortightly clamped against. the rim 13 of the shell 10.

Slidably mounted within the sleeve lt), lor adjustment relative to theparabolic retlector, is a larnp socket 2T. The lainp socket "T includesa cylindrical metal shell 2S having a tlanged metal cap 29 rigidlysecured at one end thereof, and a spring pressed, cylindrical metal plug3() slidably mounted within the shell. its clearly shown in Fig. 4, theshell 28 is ot' a greater length than the sleeve l) and projects beyondthe rear end thereof, and the cap 29 is provided with an enlarged boreas indicated at 3l adapted to looselyr re ceive the tree end of thesleeve 15). The cylindrical plug 3U comprises a cup :52

adapted to receive a tightly titting eylindri cal block ot iiisulatingmaterial 33, provided with a central bore 34- adapted to receive a.tightly litting, cylindrical metal plug :35, with the inner end ol'l thelatter slightly spaced from the bottom of the bore 1,54. The plug andthe cup 3:2 may be formed ot any suitable metal but are preferably madeof brass. The block ol insulating material 33 is also provided with alateral opening lo comn'iunicating with the bore 34, and the cup isprovided with a laterally extending screw threaded opening 3T. axiallyalined with the opening 36 and olI relatively greater diameter. Athreaded plug 35. jn'ovided with an axial bore, is rigidly secured tothe cup by being screwed into the opening 3T. The shank of the plug 38extends through alined guide slots 3S) and 10, in .the shell 2S and thesleeve 19 respectively, and serves as a stop to limit the outwardmovement of the plug 30 within the shell 2&5, by engagement with theouter end of the slot The cylindrical inet-al plug is provided with anaxial threaded opening therethrough, adapted to receive the contactscrew 4l.

As clearly shown in Fig. l, the insulated conductor t2 is extendedthrough the bore nl the plug and the aligned opening Bti o t' the blockof insulation, with the stripped end fl-3 thereof clamped between theinner end of the contact screw l] and the bottom ol' the bore 34.

To yieldingly press the plug 3U in outA wardly projected position andhold the contact screw all in abutment with the contact point on thelamp bulb 48, a spring ll is interposed between the inner lace ol` thecap and the inner end of the plug Bt). The sleeve 2S is provided withthe usual bayonet slots -l.f' shown in dotted lines in Fig. 4 which are.adapted to receive and co-act with the pins LG projecting atdiametrically opposite sides from the metal collar 4T of the lamp bulbTo provide for adjustment ot the lamp socket 27 and the bulb 48 withrespect to the parabolic reflector 1G, to eii`ect a proper tocusing olthe light rays, an adjustingr screw at) is provided. The adjusting screwlll is rotatably mounted in an opening 5U in the protuberance l1 of thehousing, and is provided at the outer end thereof with a rigidlyconnected operating head or knob 5l, abutting the outer side of theprotubcrance. lnteriorly ol' the housing, the screw 4t) is provided witha collar 5:2 adapted to abut the, inner side of the wall of the housing.'l`he collar 52 together with the head 5l act as a means i'or preventinglongitudinal mov ement ol the adjusting screw. ll`he threaded end 53 ollthe adjusting screw 4) is adapted to work in a threaded recess [rl inthc rap il). A coiled spring 5:3 is interposed between the, peripheralflange .Bti ot' the rap :Sl and the inner side ot the end wall ol theprotuberance ll, and serves to press the sockel outwardly, therebyproducing .sullicient trietion between the scre and the rap and betweenthe knob 5l and the housing to prevent accidental turning ol.' thescrew, which might result in disturbing the :nljustment ol' the socket.

To prevent moisture l'rom entering the shell by way ol' the jointbetween the screw ll) and the wall ot the opening .'30, the head or knob5l is provided with an annular chan nel 5T adapted to receive a packingwasher 5S. 'lhe washer 5b is preferably saturated with pure petroleum toell'ectively obstruct. the passage olI moisture between the .same andthe outer end ol' the protulafram'c ll. In this connection, it ispointed out that the gasket. Ztl which is interposed between the lens Z2and the reflector lti nrav alfo be treated in this manner, ilI desired.i

The housing l() is provided at one side thereof with an outwardly drawnportion as indicated at of), perl'orattal as indicated ai (5() toreceive a hollow metal plug lll the joint between the plug and they.shell lltl beine' soldered or otherwise sealed to prevent the entranceof moisture.

ln this connection it is pointed out that the entrance olmoisture intothe shell lt) is cl'- iectively prevented b v forming a tight joie(between the one piece shell lt) anditllc plugl til, and providing, ashereinlwliore dewribedi the water-seal gaskets, in the joint between theshell and the knob .'31, and in the joint between the reflector lll andthe lensl lf2.'

The hollow plug til extends at right angles to the horizontal axis ol'the lamp head.. as clearly shown in Fig. 2 and the conductor l2 isadapted to be passed therethrough. .\t the outer end, the hollow portionof the plug til is reduced in diameter as indicated at (52 and theconductor l2 is adapted to enteral theretln'ougb, a sleeve U3 ol'insulating material heilig' interposed between the coiiductor and theinner wall ol` the reduced hollow portion G2. A metal contact plugl (34mav be attached to the end ol' the conductor, saiil plug beingsurrounded by the insulatingr sleeve (53 and having its outer endprojecting a short distance beyond the end ol' the sleeve and serving asa means for connecting the (lili conductor 42 to the lighting circuit,as shown in my co-peiiding application Serial Number 525,076, filedDecember 27, 192i.

To adjust the lamp bulb with reference to the parabolic reflector toproperly 'focus the light rays, the leed screw 49 is rotated in either aright or left hand direction, in cordance with the direction in which itis l'ouiid necessary to adust the bulb, the screw being properlymanipulated by means ol the head or knob` 5l, thereby moving the bulbeither toward or away from the reflector. As the threads 53 are indirect engagement with the cap 29, which is rigidly secured to thesleeve 28, the sleeve 28 together with all the parts arried thereby,including`l the lamp bulb, which is held in fixed position withreference to the sleeve by the spring pressed plug 30 holding the pins46 in abutment with the outer ends oil' the inner branches ot thebayonet slots, will be positively adjusted., as a unit. In thisconnection it will be noted that the slot l0 in the sleeve lt) in which'the plug 38 slides, is, of sullicient length to permit 'the maximummovement accesso ry to effect the pi'oper adjustment ot the bulb.

By rigidly securing the sleeve 19 to the parabolic reflector i6, ashereinbetore described, the lamp socket 27 which is positiveiv guided inits sliding movement by the sleeve, will always move in a fixed pathwith reference to the reflector, regardless of any slight displacementof the reflector with reteience to the housing, and a true focus maytherefore always beobtained. i

another important feature oit my invention is the construction of thespring pressed plug 30, in that the conductor .is directlyconiiecied tothe plug by being positively clamped by the contact screw al which en-Yes directly'ivith the Contact point of the lamp bulb, whereby thecurrent is directly transmitted independently of the sliding pai-ts bywhich the position of the bulb adjusted; and in that the Contact screuTis i ried directly by the brass plug 'which is mounted in the insulation33, Which in turn is mounted in the brass cup whereby, va-

e due to shrinkage of the insulating ateiial do not affect the positionof the outer end ol the contact screw.

It vll also be noted that all of the parts which are in sliding contactare of metal so that Wear is reduced to the minimum with 1-nientminimization ot' danger et looseor play and permitting of accuratelitandfinish ot" the parts in the original asuembly.

l have herein shown and described What l new consider' the preferredmanner of carryingout the invention, but the saine is merelyillustrativeand l contemplate all changes and modifications that come Within thescope oli the claims appended hereto.

Iclainn` i r l. In a device of' the character described, thecombinationwith a reflector; ol a Water tight housing enclosing saidreflector and having a portion spaced therefrom;` guide means extendingbetween said reflector and 'the adjaceutportion ol said housing; a lampsocket member slidably mounted in said guide means; a headed adjustingscrew 'i extending through the adjacent wall o't' said housing andcoacting with the socket mein bei' to adjust the latter, the head ofsaid screw being exterior of the adjacent Wall of said shell and adaptedto bear thereon, the head of said screiv being provided with a recessit'or the reception of packing to render the housing Water tight at thispoint.

2. In a device of the character described,

the combination ivith a lamp` housing; of a` the combination withareflector; of a housing` enclosing said. reflector and having a por-Ation spaced therefrom; a guide sleeve rigidly connected with saidreflector and terminatiingl short ol the adjacent wall of said housing,said .sleeve having a longitudinal slot therein; a lamp carrying isleeve slidably mounted in said guide sleeve and provided with a slotregistering With the slot in said guide sleeve, said sleeve beingarranged to have a lamp detachably secured at one end; a cup shaped aphaving a bottom and a side Wall, said cap being rigidly secured to saidcarrying sleeve and having its bottoni closing the opposite end ot saidcarrying sleeve, the side Wall of said cap slidably fitting over theexterior of the outer end of said guide sleeve and having outwardlyturned flanges there-` on; a contact plug slidably disposed in saidcarrying sleeve; a conductor extending' through the slots in saidsleeves and coni nected With said plug and arranged to pre` vent.relative rotation of' said carrying sleeve ivitli respect to said guidesleeve; resilient means interposed between the bottom of said cap andthe plug tor urging said plug toivard said lamp; resilient meansinterposed between the Wall of said housing and the outwardly turnedflanges ot said cap; and an adjusting screw vthreaded into said cap androtatably mounted in said Wallifor effectill) thi

lilitl lll) titi

ing longitudinal movement of said carrying sleeve. and its associatedparts in unison.

sl. ln a device of the character described. the combination with areflector; of a housing enclosing said reflector and having a por tionspaced therefrom; a guide sleeve rigidly connected with said retlectorand terminating short ot the adjacent portion of the housing; a lampcarrying sleeve slidably mounted in said guide sleeve and arranged tohave a lamp dctachably sectn'ed at one end, said sleeve being of alength to project rearwardly beyond the terminus ofi said guide sleeve:t cap rigidly secured to said carrying sleeve and having forwardlyextending portions fitting over the r xar end of said guide sleeve; acontact 'plug slidably disposed in said carrying :sleeve: resilientmeans interposed lietween the inner surface of said cap and said contactplug; resilient means interposed between the adjacent. portion of saidhous ing and the forwardly extending portions ot said cap; and anadjusting screw extending through the spaced portion of said housing andthreaded into said cap.

il. ln a device ol the character described, the combination with areflector; o't' a housingl enclosing said reflector and having a portionspaced therefrom; a guide sleeve rigidly connected with said reflectorand terminating in an open end short ol the adjacent wall ot saidhousing. said sleeve having a longitudinally extending slot therein; alamp carryiiml sleeve slidably mounted in said guide sleeve and providedwith a slot registering with the slot in said guide sleevec saidcarrying sleeve` havingl holding means arranged to detachably secure alamp at one end. and having,r a wall at. its opposite end normallyarral'lged beyond the terminus ol'. the rear end ol' said guide sleeveand closing the open end ot the latter; a contact plug slidably disposedin said carrying sleeve.' a conductor extending tln'ollgh the slots insaid sleeves and connected with said plug and arranged to preventrelative rotation otl said carrjdng sleeve with respect to said guidesleeve; a lamp disposed in said holding means: resilient meansinterposed between the inner surface ot said end wall and the plug forurging the latter into engagement. with the Contact means of said lampand serving to maintain said lamp against accidental detachment fromsaid holdingl means; additional resilient means interposed between thespaced portion of said honsing and the exterior surface of said endwall, both of said resilient means being confined substantially to thespace between the terniinm of said guide sleeve and the adjacent portionof said housing. said additional resilient means pressing said carriersleeve toward said guide sleeve; and an adjusting screw threaded intosaid wall and rotatably mounted in said housing for effecting movementof said carrying sleeve and its associated parts in unison.

t5. In a device ol the character described. the, combination with aretlcctor: of a housing, enclosing .said reflector and having a portionspaced therefrom: a lamp carrying sleeve having holding means arrangedto dctachably .secure a lamp adjacent the forward end: a cap closinglthe. rear end of the sleeve. and having an outwardly extendingprojection formed on its exterior, guiding means rigid with thcreflector and per mitting relative adjustment of the lamp carryingsleeve with relation to the rcllcctor; a contact plug slidably disposedin said carr \'ing sleeve and adapted to co-opcratc with the lamp: anadjusting member carried by said housing and connected with the rerr cndof .said cap for imparting longitudinal nu'ivcmcnt thereto and to thcsleeve: resilient means interposed bctwccn said contact plug and thcinner face of the cap and serving to maintain ct'igagcment of saidcontact plug` with the lamp. and to secure said lamp against accidentaldcta'h ment with respect to said holding means: anti additionalresilient means interposed between thc spaced portion otl said housingand the projection on said cap at the rear cnd ot' said lamp carryingsleeve. both of said resilient means being arranged con centrically andextending substantially at right angles to the longitudinal axis of saidlamp carrying sleeve.

i'. Vln a device of the character described` the combination with arcllccto' and a housing having a wall spaced from said rctlcctor: aguide. sleeve rigidly secured to said rellector. extending toward thcadjacent portion ol' lsaid housitmI and terminating shortv thereof: acarrying sleeve unit. conrprising: a` mcn'iber open at its forward endand closed at its rear end. said carnving` sleeve being telescopicallyengaged with said luide sleeve and longittulinally movable as a wholewith respect, to said guide sleeve. the latter and said carnving sleevebeing provided with registering slots inter mediate their ends. and theforwart'l end of said carrying sleeve being provided with larvonet slotsadapted to have a lamp detachably disposed therein. one pole of whichis' grounded on said sleeves. said carrying sleeve having a contact plugslidahly dis@ posed therein. and insulated therefrom. said plutl beingconnected with a conductor ex tending outwardly through said slots to asource of electric supply. and a coil springr in said carrying sleeveinterposed between the rear 'all of the latter and insulated from saidcontacty plugand hearing upon the latter to urge tln` sannintoengagement with the other pole of said lamp. and exert.- ing pressure onsaid lamp to resiliently maintain the same in said bayonet slots; and

lll)

tno

lllfn llt) an adjusting mernhei1 rotatably mounted in the housing Walland having a threaded po1'- tion in threaded engagement with the rem?end. ot said carrying sleeve and extending into the letter and into thecoiled spring tlierein, said mljusting member serving to maintain saidcarrying sleeve in position and to adjust the same, With the associatedlamp and Contact means, longitudinally of the guide sleeve, as a unit.

In Witness that I claim the foregoing I have hereunto subscribed my namethis 9th day of March, '1923.

CLIFFORD SKLAREK.

